Photodissociation of interstellar N2

  title={Photodissociation of interstellar N2},
  author={Xiaohu. Li and Alan N. Heays and Ruud Visser and Wim Ubachs and Brenton R. Lewis and Stephen T Gibson and E. F. van Dishoeck},
  journal={Astronomy and Astrophysics},
Aims. Following the recent detection of 36 ArH + in the Crab nebula spectrum, we have computed the photodissociation rate of ArH + in order to constrain the physical processes at work in this environment. Methods. Photodissociation cross-sections of ArH + were computed in an ab initio approach that includes an explicit account of spin‐ orbit coupling. Results. We report the photodissociation cross-section of ArH + as a function of wavelength. Photodissociation probabilities are derived for di… 
Photodissociation and photoionisation of atoms and molecules of astrophysical interest
A new collection of photodissociation and photoionisation cross sections for 102 atoms and molecules of astrochemical interest has been assembled, along with a brief review of the basic processes
Photodissociation and chemistry of N2 in the circumstellar envelope of carbon-rich AGB stars
Context. The envelopes of asymptotic giant branch (AGB) stars are irradiated externally by ultraviolet photons; hence, the chemistry is sensitive to the photodissociation of N2 and CO, which are
Isotope selective photodissociation of N-2 by the interstellar radiation field and cosmic rays
Photodissociation of 14N2 and 14N15N occurs in interstellar clouds, circumstellar envelopes, protoplanetary discs, and other environments due to UV radiation from stellar sources and the presence of
The photodissociation of CO in circumstellar envelopes
Carbon monoxide is the most abundant molecule after H 2 and is important for chemistry in circumstellar envelopes around late-type stars. The size of the envelope is important when modelling low- J
The efficiency of photodissociation for molecules in interstellar ices
Processing by interstellar photons affects the composition of the icy mantles on interstellar grains. The rate of photodissociation in solids differs from that of molecules in the gas phase. The aim
Branching Ratios in Vacuum Ultraviolet Photodissociation of CO and N2: Implications for Oxygen and Nitrogen Isotopic Compositions of the Solar Nebula
Author(s): Shi, X; Yin, QZ; Gao, H; Chang, YC; Jackson, WM; Wiens, RC; Ng, CY | Abstract: © 2017. The American Astronomical Society. All rights reserved.. NASA's Genesis mission reveals that the rare
Depletion of 15N in the center of L1544: Early transition from atomic to molecular nitrogen?
We performed sensitive observations of the N15ND+(1–0) and 15NND+(1–0) lines toward the prestellar core L1544 using the IRAM 30 m telescope. The lines are not detected down to 3σ levels in 0.2 km s−1
Probing UV-sensitive Pathways for CN and HCN Formation in Protoplanetary Disks with the Hubble Space Telescope
The UV radiation field is a critical regulator of gas-phase chemistry in surface layers of disks around young stars. In an effort to understand the relationship between photocatalyzing UV radiation
Methanol along the path from envelope to protoplanetary disc
Interstellar methanol is considered to be a parent species of larger, more complex organic molecules. A physicochemical simulation of infalling parcels of matter is performed for a low-mass
Robustness of N2H+ as tracer of the CO snowline
Context. Snowlines in protoplanetary disks play an important role in planet formation and composition. Since the CO snowline is difficult to observe directly with CO emission, its location has been


The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
Aims. Photodissociation by UV light is an important destruction mechanism for carbon monoxide (CO) in many astrophysical environments, ranging from interstellar clouds to protoplanetary disks. The
Photodissociation regions. I - Basic model. II - A model for the Orion photodissociation region
A theoretical parameter study of the temperature and chemical structure of dense photodissociation regions and their resultant spectrum is presented. Models are discussed which are relevant not only
The photodissociation and chemistry of interstellar CO
Recent work on the vacuum UV absorption spectrum of CO to the description of the photodissociation of interstellar CO and its principal isotopic varieties is discussed. The effects of line
Photoprocesses in protoplanetary disks.
The parameters which make disks different from more traditional PDRs are discussed, including the shape of the UV radiation field, grain growth, the absence of PAHs, the gas/dust ratio and the presence of inner holes.
The chemical effects of mutual shielding in photon-dominated regions
We investigate the importance of the shielding of chemical photorates by molecular hydrogen photodissociation lines and the carbon photoionization continuum deep within models of photon-dominated
Probing the Evolutionary Status of Starless Cores through N2H+ and N2D+ Observations
We have undertaken a survey of N2H+ and N2D+ toward 31 low-mass starless cores using the IRAM 30 m telescope. Our main objective has been to determine the abundance ratio of N2D+ and N2H+ toward the
Although they are only minor constituents of the interstellar medium, halogen-containing molecules are of special interest because of their unique thermochemistry. Here, we present a theoretical
Theoretical study of the ArH+ photodissociation.
The multireference Spin-Orbit (SO) Configuration Interaction (CI) method in its Lambda-S Contracted SO-CI (LSC-SO-CI) version is employed to calculate potential energy curves for the ground and
Chemistry and evolution of Titan's atmosphere
A review will be given of the scientific findings from the Voyager Flyby of Titan with emphasis on chemistry and implications on evolution. Magnetospheric electrons interact with Titan's exosphere to